Hole exports as body (Save as mesh)

[NVNDO]

Hey everyone,

Something I've been struggling with is that, when saving a model (as a whole) as mesh, holes get recognized as bodies in Bambu Studio (Slicer for 3D printing)

Here is how the file originally looks like:

Here how it ends up in Bambu Studio:

This is how it should actually look like:

Anyone any clue..?

[NVNDO · Accepted solution]

In this case, I will answer my own question, as many people might come across this: The solution to this is exporting as .STEP file. 

Then the holes get exported and recognized as such.